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net/http: update bundled http2

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Updates x/net/http2 to git rev 5916dcb1 for:

* http2, lex/httplex: make Transport reject bogus headers before sending
  https://golang.org/cl/23229

* http2: reject more trailer values
  https://golang.org/cl/23230

Fixes #14048
Fixes #14188

Change-Id: Iaa8beca6e005267a3e849a10013eb424a882f2bb
Reviewed-on: https://go-review.googlesource.com/23234
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Brad Fitzpatrick 2016-05-19 02:13:36 +00:00
parent 8d428ed218
commit 255e206b2b
8 changed files with 152 additions and 160 deletions
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1
src/go/build/deps_test.go
View File

@ -379,6 +379,7 @@ var pkgDeps = map[string][]string{
"mime/multipart", "runtime/debug",
"net/http/internal",
"golang.org/x/net/http2/hpack",
"golang.org/x/net/lex/httplex",
"internal/nettrace",
"net/http/httptrace",
},

216
src/net/http/h2_bundle.go
View File

@ -26,6 +26,7 @@ import (
"errors"
"fmt"
"golang.org/x/net/http2/hpack"
"golang.org/x/net/lex/httplex"
"io"
"io/ioutil"
"log"
@ -1864,7 +1865,7 @@ func (fr *http2Framer) readMetaFrame(hf *http2HeadersFrame) (*http2MetaHeadersFr
hdec.SetEmitEnabled(true)
hdec.SetMaxStringLength(fr.maxHeaderStringLen())
hdec.SetEmitFunc(func(hf hpack.HeaderField) {
if !http2validHeaderFieldValue(hf.Value) {
if !httplex.ValidHeaderFieldValue(hf.Value) {
invalid = http2headerFieldValueError(hf.Value)
}
isPseudo := strings.HasPrefix(hf.Name, ":")
@ -1874,7 +1875,7 @@ func (fr *http2Framer) readMetaFrame(hf *http2HeadersFrame) (*http2MetaHeadersFr
}
} else {
sawRegular = true
if !http2validHeaderFieldName(hf.Name) {
if !http2validWireHeaderFieldName(hf.Name) {
invalid = http2headerFieldNameError(hf.Name)
}
}
@ -2397,58 +2398,23 @@ var (
http2errInvalidHeaderFieldValue = errors.New("http2: invalid header field value")
)
// validHeaderFieldName reports whether v is a valid header field name (key).
// RFC 7230 says:
// header-field = field-name ":" OWS field-value OWS
// field-name = token
// token = 1*tchar
// tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
// "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
// validWireHeaderFieldName reports whether v is a valid header field
// name (key). See httplex.ValidHeaderName for the base rules.
//
// Further, http2 says:
// "Just as in HTTP/1.x, header field names are strings of ASCII
// characters that are compared in a case-insensitive
// fashion. However, header field names MUST be converted to
// lowercase prior to their encoding in HTTP/2. "
func http2validHeaderFieldName(v string) bool {
func http2validWireHeaderFieldName(v string) bool {
if len(v) == 0 {
return false
}
for _, r := range v {
if int(r) >= len(http2isTokenTable) || ('A' <= r && r <= 'Z') {
if !httplex.IsTokenRune(r) {
return false
}
if !http2isTokenTable[byte(r)] {
return false
}
}
return true
}
// validHeaderFieldValue reports whether v is a valid header field value.
//
// RFC 7230 says:
// field-value = *( field-content / obs-fold )
// obj-fold = N/A to http2, and deprecated
// field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
// field-vchar = VCHAR / obs-text
// obs-text = %x80-FF
// VCHAR = "any visible [USASCII] character"
//
// http2 further says: "Similarly, HTTP/2 allows header field values
// that are not valid. While most of the values that can be encoded
// will not alter header field parsing, carriage return (CR, ASCII
// 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII
// 0x0) might be exploited by an attacker if they are translated
// verbatim. Any request or response that contains a character not
// permitted in a header field value MUST be treated as malformed
// (Section 8.1.2.6). Valid characters are defined by the
// field-content ABNF rule in Section 3.2 of [RFC7230]."
//
// This function does not (yet?) properly handle the rejection of
// strings that begin or end with SP or HTAB.
func http2validHeaderFieldValue(v string) bool {
for i := 0; i < len(v); i++ {
if b := v[i]; b < ' ' && b != '\t' || b == 0x7f {
if 'A' <= r && r <= 'Z' {
return false
}
}
@ -2579,86 +2545,6 @@ func (e *http2httpError) Temporary() bool { return true }
var http2errTimeout error = &http2httpError{msg: "http2: timeout awaiting response headers", timeout: true}
var http2isTokenTable = [127]bool{
'!': true,
'#': true,
'$': true,
'%': true,
'&': true,
'\'': true,
'*': true,
'+': true,
'-': true,
'.': true,
'0': true,
'1': true,
'2': true,
'3': true,
'4': true,
'5': true,
'6': true,
'7': true,
'8': true,
'9': true,
'A': true,
'B': true,
'C': true,
'D': true,
'E': true,
'F': true,
'G': true,
'H': true,
'I': true,
'J': true,
'K': true,
'L': true,
'M': true,
'N': true,
'O': true,
'P': true,
'Q': true,
'R': true,
'S': true,
'T': true,
'U': true,
'W': true,
'V': true,
'X': true,
'Y': true,
'Z': true,
'^': true,
'_': true,
'`': true,
'a': true,
'b': true,
'c': true,
'd': true,
'e': true,
'f': true,
'g': true,
'h': true,
'i': true,
'j': true,
'k': true,
'l': true,
'm': true,
'n': true,
'o': true,
'p': true,
'q': true,
'r': true,
's': true,
't': true,
'u': true,
'v': true,
'w': true,
'x': true,
'y': true,
'z': true,
'|': true,
'~': true,
}
type http2connectionStater interface {
ConnectionState() tls.ConnectionState
}
@ -4103,6 +3989,10 @@ func (st *http2stream) processTrailerHeaders(f *http2MetaHeadersFrame) error {
if st.trailer != nil {
for _, hf := range f.RegularFields() {
key := sc.canonicalHeader(hf.Name)
if !http2ValidTrailerHeader(key) {
return http2StreamError{st.id, http2ErrCodeProtocol}
}
st.trailer[key] = append(st.trailer[key], hf.Value)
}
}
@ -4508,9 +4398,9 @@ func (rws *http2responseWriterState) hasTrailers() bool { return len(rws.trailer
// written in the trailers at the end of the response.
func (rws *http2responseWriterState) declareTrailer(k string) {
k = CanonicalHeaderKey(k)
switch k {
case "Transfer-Encoding", "Content-Length", "Trailer":
if !http2ValidTrailerHeader(k) {
rws.conn.logf("ignoring invalid trailer %q", k)
return
}
if !http2strSliceContains(rws.trailers, k) {
@ -4831,6 +4721,41 @@ func http2new400Handler(err error) HandlerFunc {
}
}
// ValidTrailerHeader reports whether name is a valid header field name to appear
// in trailers.
// See: http://tools.ietf.org/html/rfc7230#section-4.1.2
func http2ValidTrailerHeader(name string) bool {
name = CanonicalHeaderKey(name)
if strings.HasPrefix(name, "If-") || http2badTrailer[name] {
return false
}
return true
}
var http2badTrailer = map[string]bool{
"Authorization": true,
"Cache-Control": true,
"Connection": true,
"Content-Encoding": true,
"Content-Length": true,
"Content-Range": true,
"Content-Type": true,
"Expect": true,
"Host": true,
"Keep-Alive": true,
"Max-Forwards": true,
"Pragma": true,
"Proxy-Authenticate": true,
"Proxy-Authorization": true,
"Proxy-Connection": true,
"Range": true,
"Realm": true,
"Te": true,
"Trailer": true,
"Transfer-Encoding": true,
"Www-Authenticate": true,
}
const (
// transportDefaultConnFlow is how many connection-level flow control
// tokens we give the server at start-up, past the default 64k.
@ -5423,20 +5348,28 @@ func (cc *http2ClientConn) RoundTrip(req *Request) (*Response, error) {
return nil, http2errClientConnUnusable
}
cs := cc.newStream()
cs.req = req
cs.trace = http2requestTrace(req)
hasBody := body != nil
// TODO(bradfitz): this is a copy of the logic in net/http. Unify somewhere?
var requestedGzip bool
if !cc.t.disableCompression() &&
req.Header.Get("Accept-Encoding") == "" &&
req.Header.Get("Range") == "" &&
req.Method != "HEAD" {
cs.requestedGzip = true
requestedGzip = true
}
hdrs := cc.encodeHeaders(req, cs.requestedGzip, trailers, contentLen)
hdrs, err := cc.encodeHeaders(req, requestedGzip, trailers, contentLen)
if err != nil {
cc.mu.Unlock()
return nil, err
}
cs := cc.newStream()
cs.req = req
cs.trace = http2requestTrace(req)
hasBody := body != nil
cs.requestedGzip = requestedGzip
cc.wmu.Lock()
endStream := !hasBody && !hasTrailers
werr := cc.writeHeaders(cs.ID, endStream, hdrs)
@ -5689,7 +5622,7 @@ type http2badStringError struct {
func (e *http2badStringError) Error() string { return fmt.Sprintf("%s %q", e.what, e.str) }
// requires cc.mu be held.
func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trailers string, contentLength int64) []byte {
func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trailers string, contentLength int64) ([]byte, error) {
cc.hbuf.Reset()
host := req.Host
@ -5697,6 +5630,17 @@ func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trail
host = req.URL.Host
}
for k, vv := range req.Header {
if !httplex.ValidHeaderFieldName(k) {
return nil, fmt.Errorf("invalid HTTP header name %q", k)
}
for _, v := range vv {
if !httplex.ValidHeaderFieldValue(v) {
return nil, fmt.Errorf("invalid HTTP header value %q for header %q", v, k)
}
}
}
cc.writeHeader(":authority", host)
cc.writeHeader(":method", req.Method)
if req.Method != "CONNECT" {
@ -5741,7 +5685,7 @@ func (cc *http2ClientConn) encodeHeaders(req *Request, addGzipHeader bool, trail
if !didUA {
cc.writeHeader("user-agent", http2defaultUserAgent)
}
return cc.hbuf.Bytes()
return cc.hbuf.Bytes(), nil
}
// shouldSendReqContentLength reports whether the http2.Transport should send
@ -6622,13 +6566,13 @@ func http2encodeHeaders(enc *hpack.Encoder, h Header, keys []string) {
for _, k := range keys {
vv := h[k]
k = http2lowerHeader(k)
if !http2validHeaderFieldName(k) {
if !http2validWireHeaderFieldName(k) {
continue
}
isTE := k == "transfer-encoding"
for _, v := range vv {
if !http2validHeaderFieldValue(v) {
if !httplex.ValidHeaderFieldValue(v) {
continue
}

6
src/net/http/http.go
View File

@ -6,6 +6,8 @@ package http
import (
"strings"
"golang.org/x/net/lex/httplex"
)
// maxInt64 is the effective "infinite" value for the Server and
@ -35,3 +37,7 @@ func removeEmptyPort(host string) string {
}
return host
}
func isNotToken(r rune) bool {
return !httplex.IsTokenRune(r)
}

8
src/net/http/server.go
View File

@ -27,6 +27,8 @@ import (
"sync"
"sync/atomic"
"time"
"golang.org/x/net/lex/httplex"
)
// Errors used by the HTTP server.
@ -783,15 +785,15 @@ func (c *conn) readRequest(ctx context.Context) (w *response, err error) {
if len(hosts) > 1 {
return nil, badRequestError("too many Host headers")
}
if len(hosts) == 1 && !validHostHeader(hosts[0]) {
if len(hosts) == 1 && !httplex.ValidHostHeader(hosts[0]) {
return nil, badRequestError("malformed Host header")
}
for k, vv := range req.Header {
if !validHeaderName(k) {
if !httplex.ValidHeaderFieldName(k) {
return nil, badRequestError("invalid header name")
}
for _, v := range vv {
if !validHeaderValue(v) {
if !httplex.ValidHeaderFieldValue(v) {
return nil, badRequestError("invalid header value")
}
}

6
src/net/http/transfer.go
View File

@ -17,6 +17,8 @@ import (
"strconv"
"strings"
"sync"
"golang.org/x/net/lex/httplex"
)
// ErrLineTooLong is returned when reading request or response bodies
@ -561,9 +563,9 @@ func shouldClose(major, minor int, header Header, removeCloseHeader bool) bool {
}
conv := header["Connection"]
hasClose := headerValuesContainsToken(conv, "close")
hasClose := httplex.HeaderValuesContainsToken(conv, "close")
if major == 1 && minor == 0 {
return hasClose || !headerValuesContainsToken(conv, "keep-alive")
return hasClose || !httplex.HeaderValuesContainsToken(conv, "keep-alive")
}
if hasClose && removeCloseHeader {

6
src/net/http/transport.go
View File

@ -26,6 +26,8 @@ import (
"strings"
"sync"
"time"
"golang.org/x/net/lex/httplex"
)
// DefaultTransport is the default implementation of Transport and is
@ -324,11 +326,11 @@ func (t *Transport) RoundTrip(req *Request) (*Response, error) {
isHTTP := scheme == "http" || scheme == "https"
if isHTTP {
for k, vv := range req.Header {
if !validHeaderName(k) {
if !httplex.ValidHeaderFieldName(k) {
return nil, fmt.Errorf("net/http: invalid header field name %q", k)
}
for _, v := range vv {
if !validHeaderValue(v) {
if !httplex.ValidHeaderFieldValue(v) {
return nil, fmt.Errorf("net/http: invalid header field value %q for key %v", v, k)
}
}

63
src/net/http/lex.go → src/vendor/golang.org/x/net/lex/httplex/httplex.go generated vendored
View File

@ -1,16 +1,19 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
// Package httplex contains rules around lexical matters of various
// HTTP-related specifications.
//
// This package is shared by the standard library (which vendors it)
// and x/net/http2. It comes with no API stability promise.
package httplex
import (
"strings"
"unicode/utf8"
)
// This file deals with lexical matters of HTTP
var isTokenTable = [127]bool{
'!': true,
'#': true,
@ -91,18 +94,18 @@ var isTokenTable = [127]bool{
'~': true,
}
func isToken(r rune) bool {
func IsTokenRune(r rune) bool {
i := int(r)
return i < len(isTokenTable) && isTokenTable[i]
}
func isNotToken(r rune) bool {
return !isToken(r)
return !IsTokenRune(r)
}
// headerValuesContainsToken reports whether any string in values
// HeaderValuesContainsToken reports whether any string in values
// contains the provided token, ASCII case-insensitively.
func headerValuesContainsToken(values []string, token string) bool {
func HeaderValuesContainsToken(values []string, token string) bool {
for _, v := range values {
if headerValueContainsToken(v, token) {
return true
@ -182,20 +185,31 @@ func isCTL(b byte) bool {
return b < ' ' || b == del
}
func validHeaderName(v string) bool {
// ValidHeaderFieldName reports whether v is a valid HTTP/1.x header name.
// HTTP/2 imposes the additional restriction that uppercase ASCII
// letters are not allowed.
//
// RFC 7230 says:
// header-field = field-name ":" OWS field-value OWS
// field-name = token
// token = 1*tchar
// tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
// "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
func ValidHeaderFieldName(v string) bool {
if len(v) == 0 {
return false
}
for _, r := range v {
if !isToken(r) {
if !IsTokenRune(r) {
return false
}
}
return true
}
func validHostHeader(h string) bool {
// The latests spec is actually this:
// ValidHostHeader reports whether h is a valid host header.
func ValidHostHeader(h string) bool {
// The latest spec is actually this:
//
// http://tools.ietf.org/html/rfc7230#section-5.4
// Host = uri-host [ ":" port ]
@ -250,7 +264,7 @@ var validHostByte = [256]bool{
'~': true, // unreserved
}
// validHeaderValue reports whether v is a valid "field-value" according to
// ValidHeaderFieldValue reports whether v is a valid "field-value" according to
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2 :
//
// message-header = field-name ":" [ field-value ]
@ -266,7 +280,28 @@ var validHostByte = [256]bool{
// LWS = [CRLF] 1*( SP | HT )
// CTL = <any US-ASCII control character
// (octets 0 - 31) and DEL (127)>
func validHeaderValue(v string) bool {
//
// RFC 7230 says:
// field-value = *( field-content / obs-fold )
// obj-fold = N/A to http2, and deprecated
// field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
// field-vchar = VCHAR / obs-text
// obs-text = %x80-FF
// VCHAR = "any visible [USASCII] character"
//
// http2 further says: "Similarly, HTTP/2 allows header field values
// that are not valid. While most of the values that can be encoded
// will not alter header field parsing, carriage return (CR, ASCII
// 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII
// 0x0) might be exploited by an attacker if they are translated
// verbatim. Any request or response that contains a character not
// permitted in a header field value MUST be treated as malformed
// (Section 8.1.2.6). Valid characters are defined by the
// field-content ABNF rule in Section 3.2 of [RFC7230]."
//
// This function does not (yet?) properly handle the rejection of
// strings that begin or end with SP or HTAB.
func ValidHeaderFieldValue(v string) bool {
for i := 0; i < len(v); i++ {
b := v[i]
if isCTL(b) && !isLWS(b) {

6
src/net/http/lex_test.go → src/vendor/golang.org/x/net/lex/httplex/httplex_test.go generated vendored
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http
package httplex
import (
"testing"
@ -24,7 +24,7 @@ func TestIsToken(t *testing.T) {
for i := 0; i <= 130; i++ {
r := rune(i)
expected := isChar(r) && !isCtl(r) && !isSeparator(r)
if isToken(r) != expected {
if IsTokenRune(r) != expected {
t.Errorf("isToken(0x%x) = %v", r, !expected)
}
}
@ -93,7 +93,7 @@ func TestHeaderValuesContainsToken(t *testing.T) {
},
}
for _, tt := range tests {
got := headerValuesContainsToken(tt.vals, tt.token)
got := HeaderValuesContainsToken(tt.vals, tt.token)
if got != tt.want {
t.Errorf("headerValuesContainsToken(%q, %q) = %v; want %v", tt.vals, tt.token, got, tt.want)
}